Small intestnl bact overgrowth, hydrogen sulfide-subtype

This code identifies a specific type of small intestinal bacterial overgrowth (SIBO) characterized by the excessive production of hydrogen sulfide gas by bacteria in the small bowel. Patients typically present with symptoms such as abdominal pain, bloating, diarrhea, and malabsorption. This subtype is distinct from hydrogen or methane-predominant SIBO.

Assign this code when documentation explicitly states a diagnosis of hydrogen sulfide-subtype SIBO, often confirmed by breath testing showing elevated hydrogen sulfide levels. It is appropriate for cases where the specific gaseous byproduct of bacterial overgrowth has been identified.

• Ensure documentation specifies "hydrogen sulfide-subtype" and not just general SIBO.
• Do not use this code for hydrogen-predominant or methane-predominant SIBO; separate codes exist for those subtypes.
• Consider sequencing this code after any underlying conditions contributing to SIBO, such as gastroparesis or anatomical abnormalities.